141 lines
3.9 KiB
Go
141 lines
3.9 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package common
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import (
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"fmt"
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"math/big"
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"math/rand"
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"reflect"
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)
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const (
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HashLength = 32
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AddressLength = 20
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)
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type (
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Hash [HashLength]byte
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Address [AddressLength]byte
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)
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func BytesToHash(b []byte) Hash {
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var h Hash
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h.SetBytes(b)
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return h
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}
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func StringToHash(s string) Hash { return BytesToHash([]byte(s)) }
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func BigToHash(b *big.Int) Hash { return BytesToHash(b.Bytes()) }
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func HexToHash(s string) Hash { return BytesToHash(FromHex(s)) }
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// Don't use the default 'String' method in case we want to overwrite
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// Get the string representation of the underlying hash
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func (h Hash) Str() string { return string(h[:]) }
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func (h Hash) Bytes() []byte { return h[:] }
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func (h Hash) Big() *big.Int { return Bytes2Big(h[:]) }
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func (h Hash) Hex() string { return "0x" + Bytes2Hex(h[:]) }
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// Sets the hash to the value of b. If b is larger than len(h) it will panic
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func (h *Hash) SetBytes(b []byte) {
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if len(b) > len(h) {
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b = b[len(b)-HashLength:]
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}
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copy(h[HashLength-len(b):], b)
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}
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// Set string `s` to h. If s is larger than len(h) it will panic
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func (h *Hash) SetString(s string) { h.SetBytes([]byte(s)) }
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// Sets h to other
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func (h *Hash) Set(other Hash) {
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for i, v := range other {
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h[i] = v
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}
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}
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// Generate implements testing/quick.Generator.
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func (h Hash) Generate(rand *rand.Rand, size int) reflect.Value {
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m := rand.Intn(len(h))
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for i := len(h) - 1; i > m; i-- {
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h[i] = byte(rand.Uint32())
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}
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return reflect.ValueOf(h)
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}
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func EmptyHash(h Hash) bool {
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return h == Hash{}
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}
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/////////// Address
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func BytesToAddress(b []byte) Address {
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var a Address
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a.SetBytes(b)
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return a
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}
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func StringToAddress(s string) Address { return BytesToAddress([]byte(s)) }
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func BigToAddress(b *big.Int) Address { return BytesToAddress(b.Bytes()) }
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func HexToAddress(s string) Address { return BytesToAddress(FromHex(s)) }
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// IsHexAddress verifies whether a string can represent a valid hex-encoded
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// Ethereum address or not.
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func IsHexAddress(s string) bool {
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if len(s) == 2+2*AddressLength && IsHex(s[2:]) {
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return true
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}
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if len(s) == 2*AddressLength && IsHex(s) {
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return true
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}
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return false
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}
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// Get the string representation of the underlying address
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func (a Address) Str() string { return string(a[:]) }
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func (a Address) Bytes() []byte { return a[:] }
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func (a Address) Big() *big.Int { return Bytes2Big(a[:]) }
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func (a Address) Hash() Hash { return BytesToHash(a[:]) }
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func (a Address) Hex() string { return "0x" + Bytes2Hex(a[:]) }
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// Sets the address to the value of b. If b is larger than len(a) it will panic
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func (a *Address) SetBytes(b []byte) {
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if len(b) > len(a) {
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b = b[len(b)-AddressLength:]
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}
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copy(a[AddressLength-len(b):], b)
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}
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// Set string `s` to a. If s is larger than len(a) it will panic
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func (a *Address) SetString(s string) { a.SetBytes([]byte(s)) }
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// Sets a to other
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func (a *Address) Set(other Address) {
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for i, v := range other {
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a[i] = v
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}
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}
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// PP Pretty Prints a byte slice in the following format:
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// hex(value[:4])...(hex[len(value)-4:])
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func PP(value []byte) string {
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if len(value) <= 8 {
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return Bytes2Hex(value)
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}
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return fmt.Sprintf("%x...%x", value[:4], value[len(value)-4])
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}
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